Boletín de la Sociedad Chilena de Química
Print version ISSN 0366-1644
STEGEN, SUSANA et al. CONCENTRATIONS OG NI AND CO IN CROP PLANTS CULTIVATED IN NORTHERN CHILE. Bol. Soc. Chil. Quím. [online]. 2002, vol.47, n.3, pp. 278-287. ISSN 0366-1644. doi: 10.4067/S0366-16442002000300012.
This paper provides an overview of nickel and cobalt concentrations found in the north of Chile especially as it relates to exposure of heavy metals to humans and animals through food; to help creating a database for estimating the Ni and Co content in the native farmer´s diet of South America1). The information include levels of nickel and cobalt measured in a number of different types of vegetables (potato, broad bean, onion and alfalfa) exposed to a natural environmental contamination (especially in relation to volcanic activity and mineral composition of the soil). The simultaneous determination of Ni and Co at pH 9 after adsorptive accumulation of the respective complex with dimethylglyoxime (DMG) at the mercury drop electrode is made by adsorption differential pulse voltammetry (ADPV). The values, expressed in fresh weight, varied from 9-160 µg Kg-1 for Ni and from 1-127 µg Kg-1 for Co. At the present time, there are no established legal standards for nickel and cobalt in any vegetables in Chile
Keywords : Nickel (Ni); cobalt (Co); adsorption differential pulse voltammetry (ADPV); vegetables; North Chile.